Roll type glue applicator for carton machine



sept. 4, 1962 D. G. HUGHES 3,052,210

ROLL TYPE GLUE APPLICATOR FOR CARTON MACHINE 4 Sheets-Sheet l Sept. 4, 1962 D. G. HUGHES 3,052,210

ROLL TYPE GLUE APPLICATOR FOR CARTON MACHINE Filed May 4, 1959 4 Sheets-Sheet 2 WE/WOR GORDO/v Hue/45s www' L/Wmmvfrs 1 se l m mm Vm. \N\/ w QW ,ildm f IHI. D s WH mm mw wm sk w mm l h A M WW mm mw mm mw w L| |||J v Hmmm NN mh. MN Nk m mw mw mm mm 5w vw Nm. .\J vm .om mw mk mx Nm MN T.. .6. I J Q uw s imm SePf- 4, 1962 D. G. HUGHES 3,052,210

ROLL TYPE GLUE APPLICATOR FOR CARTON MACHINE Filed May 4, 1959 4 Sheets-Sheet 3 ;/,/v vE/v TOR DONALD Gonna/v HUGHES SePt- 4, 1962 D. G. HUGHES 3,052,210

ROLL TYPE GLUE APPLICATOR FOR CARTON MACHINE 4 Sheets-Sheet 4 Filed May 4, 1959 INVENTOR 3,052,210 ROLL TYPE GLUE APPLICATOR FOR CARTON MACHEJE Donald Gordon Hughes, San Jose, Calif., assignor to Continental Can Company, Inc., New York, NX., a corporation of New York Filed May 4, 1959, Ser. No. 819,689 1l Claims. (Cl. 118-238) The invention generally relates to the art :of manufacturing cartons, and more specifically seeks to provide a novel roll type glue applicator.

'In manufacturing of cartons, -glue is applied to only certain areas of the blank from which the cart-on is formed. Since the blanks are fed only at spaced intervals, it is not feasible to utilize a roll type applicator of the type where the roll is provided with circumferentially spaced glue applying areas inasmuch as the roll would have a too-large diameter to be practical. Attempts have been made to apply the glue by ya spraying operation, and while these attempts have met with a certain degree of success, a practical roll type glue applicator is more desirable.

Another object of the invention is to provide a roll type glue applicator for applying glue to restricted areas of a carton forming blank, the glue applicator being of the `continuous operating type and there being provided means for periodically engaging the glue applicator with la carton blank during the feeding of a carton blank to apply glue to desired areas only of a carton blank.

Stlill `another object of the invention is to provide a novel glue applicator of the roll type, which glue applicator includes a rotating roll and a glue supply pan, the pan having an open end normal-1y closed by the roll, and sides in sealed engagement with the roll so that a glue supply is maintained in ydirect contact with the roll and the glue supply may be moved with the roll.

A lfurther object of the invention is to provide a novel applicator for applying glue to limited areas of a blank utilizing a glue applying roll, the applicator including a support for the glue applying roll of a nature to permit the glue applying roll to be lifted out of contact with a blank, and there being cam means cooperating with the support to normally retain the glue applying roll out of Contact with a blank and to lower the glue applying roll into contact with the blank in timed relation to the movement of the blank relative to the glue applying roll.

Another object of the invention is to provide a glue applicator assembly including a glue applying roll, a support for the roll, a glue pan having an open end with the open end being seated against the roll and forming a seal with the roll, and latch means carried by the glue panl and engaging the support for the glue applying roll to retain the glue pan in place relative to the roll, the latch means being of the spring loaded type and resiliently urging the glue pan towards the glue applying roll.

A still further object of the invention is to provide a novel glue kapplicator for use with a blank feeding mechanism of the reciprocating type, the glue applicator including la continuously rotating glue applying roll mounted for movement out of and into contact with a blank, the position of the glue applying roll being controlled by a cam connected to the blank feeding mechanism and a follower for the cam, which follower is connected to the support for the glue applying roll, and means `automaticallly engaged at the end of the feed stroke of the blank feeding mechanism to render the cam inoperative and thus hold the glue applying roll in an elevated position during the return stroke of the blank feeding mechanism.

With the above, and other objects in view that will hereinafter appear, the nature of the invention will be more clearly understood by reference to the following de- 3,952,210 Patented Sept. 4, 1962 tailed description, the appended claims and the several views illustrated in the accompanying drawing.

In the drawings:

FIGURE 1 is a side elevational View of the glue `applicator, the stack of blanks and the blank feed means being only schematically shown.

FIGURE 2 is an enlarged fragmentary plan View, with parts in section, taken along the line 2-2 of FIGURE 1, and shows the general arrangement of the glue applying rollers.

FIGURE 3 is an enlarged fragmentary sectional view, taken along the line 3-3 of FIGURE 2, and shows the specific details of one of the glue applying rollers and the glue pan associated therewith.

FIGURE 4 is an enlarged exploded perspective view showing the details of the latch carried by the glue pan for releasably securing the glue pan to the' mounting means for the glue applying roller.

FIGURE 5 is an enlarged fragmentary transverse sectional view taken along the .line 5-5 of FIGURE 3, and shows the specific details of construction of the glue pan and the manner in which a plate for controlling the amount of glue applied by the roller is mounted.

FIGURE 6 is a perspective view on' =a small scale, showing the blank for which the glue applicator is intended, with the glue receiving areas being indicated by stippling.

FIGURE 7 is an exploded perspective view on a large scale of the cam follower arm assembly for initially -adjusting the supports -for the glue applying roller with respect to the cam.

FIGURE 8 is an enlarged exploded perspective view of the `adjustable plate of the glue pan, and shows the manner in which it is mounted.

FIGURE 9 is an enlarged exploded perspective View of the support member for engaging and holding the cam follower `arms in elevated positions during the return stroke of the blank feeding mechanism.

FIGURE l0 is a wiring diagram of the electrical control for the support member of FIGURE 9.

The invention pertains to a glue applicator which is particularly adapted to the application of glue to predetermined areas of a carton blank as the carton blank isv moved from a stack to a folding machine. Of course, by making minor changes in the structural details of the glue applicator, which wil-l be described hereinafter, the glue applicator may be readily adapted to other uses.

A carton blank for which the glue `applicator is particularly adapted is illustrated in FIGURE 6, and generally referred to by the numeral 5. The carton lblank 5 is shaped for forming a rectangular carton, and includes a pair `of end-forming portions 6. Glue 7 is applied to the end-forming portions 6 at opposite edges thereof. It willbe thus apparent that it is necessary to :apply glue to they carton blank 5 at two places adjacent each of the ends thereof.

Referenceis now made to FIGURE l, wherein there is illustrated a `stack 8 of the carton blanks 5. In a carton forming machine of `which the glue applicator will be a part, the lowermost carton blank 5 of the stackV 8 lwill Ibe moved from right to left. This is accomplished by means of a pusher head 9' which engagesA the right or rear edge of the carton `blank 5. A fluid motor of the double actin-g extensible type is provided for reciprocating the pusher `head 9. The iiuid motor is generally referred to by the numeral 10l and includes a cylinder 11 having an elongated piston rod 12. The cylinder 11 is only partially illustrated, and no means have been illustrated for mounting the cylinder 11. Also, no means have been illustrated for operating the fluid motor 10. For the purpose of the present invention, it is only necessary that thev cylinder 11 be horizontally mounted and that the iluid motor 10 be periodically actuated so as to reciprocate the pusher head 9 and feed carton blanks from the stack 8. However, the pusher head 9 is connected to the piston rod 12 `by means which includes a transverse bar 13 which is connected to the right end of the piston rod 12. The means mounting the pusher head 9 also includes a support .arm 14 which is connected to the transeafse bar 13.

The carton forming machine also includes a frame structure generally referred to by the numeral 15. The frame structure 15 includes a pair of longitudinal frame rails 16. The frame rails 16 `are connected together in any desired manner. At the left of FIGURE l, a yoke 17 extends up and over between the frame rails 16. The yoke 17 is part of a carton foldin-g mechanism which is not a part of this invention, although the yoke 17 does function in a manner to be described in more detail hereinafter.

The -glue applicator is generally referred to lby the numeral 18. The glue applicator 18 includes a pair of uprights 19 which are secured to the frame rails 16, each of the uprights 19 having a :base 20 which is seated on 4and is suitably secured to its respective frame rail 16. A longitudinally extending bar 21 lis secured to the upper end of each of the uprights 19. A pair of transverse support members 22 extend between the bars 21.

A bearing 23 is secured to the inner face of each of the uprights 19. A shaft 24 extends through the uprights 19 and projects outwardly thereof. The shaft 24 is rotatably journaled in the bearings 23, the bearings 23 being aligned.

Four support arms A25, 26, 27 and 28 are secured to the shaft 24 in spaced relation with the support arms 26 and 27 being closely adjacent each other. The support arms 25, 26, 27 and 28 extend to the left from the shaft 24, as viewed in FIGURE 2. A bearing 29 is carried by each of the support arms on the outer face thereof. A shaft 30 extends through the bearings 29 for rotation and is positioned with re-spect to the support arms by means of collars 31 mounted on the opposite ends thereof.

The -support arms .25, 26, 27 and 28 are arranged in pairs, with the support arms 25 and 26 forming one pair and the support arms 27 and 28 forming the other pair. It is to lbe noted that the support arms of each pair of support arms are left and right, and that the support arms lface each other. A glue applying roller 32 is secured to the shaft 38 intermediate the support arms 25 and 26. A similar glue applying roller 33 is secured to the shaft 30 intermediate the support arms 27 and 28.

A glue pan or tray 34 is mounted between the support arms 25 and 26 in cooperating relation with the glue applying roller or roll 32. A second glue pan or tray 35 is mounted Ibetween the support arms `27 and 28 in cooperating relation with the glue applying roller or roll 33. Since the relationship of .the glue pin 34 to Ithe glue applying roller 32 .is the same as that of the glue pan 35 to the glue applying roller 33, only the details of the glue pan -35 will -be set forth here.

The glue pan 35 is generally rectangular in outline,

and includes a bottom wall 36, `side walls 37 and 38 and -a rear wall 39. It is to be noted that the bottom wall 36 is recessed within the side walls 37 and 38, and the rea-r wall 39, so as to be disposed above the lower edges thereof. A glue control plate 48 is adjustably secured to the underside of the bottom wall 36 and is seated Within the general confines of .the side walls 37 and 38 and the rear wall 39.

As is best shown in FIGURES 5 `and 8, the -glue con trol plate 48 has a pair of elongated recesses 41 formed in the underside thereof. A pair of elongated slots 42 extend through the glue control plate 4t? and open in-to the recesses 41. A retainer, generally, referred to by the numeral 43, is seated in each of the recesses 41. Each of the retainers 43 includes a relatively large diameter circular outline lower portion 44 and a circular outline 4 upper portion 45 of a smaller diameter. A bore 46 extends through the retainer 43. The lower portion 44 of each of the retainers 43 is seated in its associated recess 41, and the upper portion 45 of each retainer 43 is seated in .the respective one of the slots 42. A fastener 47 extends through the bore 46 and is threadedly engaged in the bottom Wall 36 `to retain the glue control plate 48 in position relative to the bottom wall 36 and for longitudinal sliding movement.

'I'he purpose of the glue control plate 48 is to control the amount of glue dispensed by the glue applying roller 33. It is therefore necessary that the glue control plate 40 be longitudinally adjustable. The adjustment of the glue control plate 4t) is accomplished by means of an elongated feed screw 48 which is threadedly engaged in an internally threaded bore 49 which extends longitudinally of the glue control plate 48, The feed screw 48 extends rearwardly from the glue control plate 48 and the rear portion thereof is disposed in an opening 50 in the lower part of the rear wall 39. A circular nut 51 having a serrated outer surface is threaded on the rear portion of the feed screw 48. A retainer 52 is secured to the underside of the bottom wall 36 forwardly of the rear wall 39 and the nut 51 is positioned between and restrained against longitudinal movement by the retainer 52 and the rear wall 39.

Reference is now had to FIGURE 3 wherein it is shown that the glue applying roller 33 forms a front wall of the glue pan 35. The forward edges of the side walls 37 and 38 are recessed as at 53 to conform to the surface of the glue applying roller 33 and thus form a seal therewith. The level of the glue in the glue pan 35 will be maintained below the top of the glue applying roller 33 so that glue may escape from the glue pan 35 only between the roller 33 and the glue control plate 48. As the glue applying roller 33 rotates in a clockwise direction, a thin coat of glue will adhere to the surface of the glue applying roller '33, which glue will be transferred to the blank 5.

The glue pan 35 is held in place with respect to the glue applying roller 33 by means of a latch assembly generally referred to by the numeral 54. As is best illustrated in FIGURE 4, the latch assembly 54 includes a shaft 55 which is supported by a pair of spaced mounting blocks 56. The shaft 55 has secured thereto, intermediate the mounting blocks 56, an arm 57. A second' arm 58 is secured to the shaft 55 outwardly of the mounting blocks 56.

A stop mechanism generally referred to by the numeral 59 is associated with the arm 58. The stop mechanism 59 includes an angle bracket 60 which supports a spring 61. The outer portion of the arm 58 is provided with an internally threaded bore 62 aligned with the spring 61. A stop screw 63 extends through a flange of the angle bracket 6l), the spring 61, and is threadedly engaged in the bore 62. A lock nut 64 is threaded on the stop screw 63 to lock it in place. The stop screw 63 functions both as a retainer for the spring 61 and to limit the movement of the arm 58 away from the angle bracket 68.

As is best shown in FIGURE 3, the mounting blocks 56 are secured to the rear surface of the rear wall 39 adjacent the lower edge thereof. The arm 57, which is provided with an arcuate cross-sectional recess 65, engages the shaft 24 with the shaft `being seated in the recess 65. The angle bracket is secured to the outer surface of the side wall 38 and the spring 61 constantly bears against the arm 58 to retain the arm 57 in er1- gagement with the shaft 24. It will be seen that as the spring 61 urges the arm 58 rearwardly, the arm 57 will engage the shaft 24 and since it cannot move rearwardly, the effect of the spring 61 on the arm 58 will be to urge the glue pan 35 forwardly into the desired sealing engagement with the glue applying roller 33.

Reference is now had to FIGURE 2, wherein it isshown that each of the support arms 25, 2n, 27 and 23 is provided with an adjusting screw 66. Each adjusting screw 66 is provided with a lock nut 67 to retain it in an adjusted position. The adjusting screws 66 engage the side Walls of the glue pans 34 and 35 to center the glue pans 34- and 35 with respect to the glue applying rollers 32 and 33, respectively.

From the foregoing, it will be readily apparent that the glue pans 34 and 35 may be readily removed. When it is desired to remove a glue pan, it is merely necessary to depress either the arm 57 or the arm 53 of the latch assembly 54. With the arms so depressed, the arm 57 moves out of engagement with the shaft 24, and the glue pan to be removed may be tilted upwardly and forwardly about its associated glue roller. At the same time, each latch assembly 5ft, as set forth above, has the dual function of resiliently urging the glue pan 3d or into sealing engagement with the respective one of the glue applying rollers 32 and 33.

A combination electric motor and reduction gear unit 68 is provided for the purpose of driving the glue applying rollers 32 and 33. The combination electric motor and reduction gear unit 63 has a base 69 which is adjustably seated on the transverse support members 22. The combination electric motor and' reduction gear unit 68 also has a transversely extending drive shaft 70 on which there is mounted a drive sprocket 71. A driven sprocket 72 is secured to the shaft 311 intermediate the support arms 26 and 27. A drive chain is entrained over fthe drive sprocket 71 and the driven sprocket '72 so as to connect the driven sprocket '72 to the drive sprocket 71 for movement therewith. A housing '74- encases the drive chain 73 and the sprockets 71 and 72.

Again referring to FIGURE 3, it will be seen that the glue applying rollers 32 and 33 are provided' with a plurality of lightening openings 75. Also, underlying each of the glue applying rollers 32 and 33 is a back-up plate 76 which is, in turn, supported by an angle bracket 77. Each of the angle brackets 77 is secured to its rerespective one of the frame rails 16.

In FIGURE 3, the glue applying roller 33 is shown in its elevated inoperative position. It is to be noted that there is a spacing between the glue applying roller 33 and the back-up plate 7 5 which is only slightly greater' than the thickness of the carton blank 5. In order that the carton blank 5 will not accidentally engage the glue applying rollers 32 and 33, there are provided pairs of hold-down ngers 78 at opposite sides of the carton blank 5. Each pair of hold-down fingers 7S is supported by a plate 79 which is secured to an inner surface of the associated one of the uprights 19. The rear portions of the hold-down fingers 78 are secured to their respective mounting plates 79 by means of fasteners 80. It is to be noted that the hold-downfingers 73, which are formed of spring material, engage the carton blank 5 in advance of the movement of the carton blank over the back-up plate '76. Thus, accidental upward deflection of the carton blank 5 into engagement with the glue applying rollers 32 and 33 is prevented.

The glue applicator 18 functions to apply glue to restricted areas only of the carton blank 5, as set forth above. In order to accomplish this, it is not only necessary to provide glue applying rollers, such as the rollers 32 and 33, which are aligned with the area of the carton blank 5 to which glue is to be applied, but also to provide means for lowering the glue applying rollers 32 and 33 into engagement with the carton blank 5 in timed relation to the movement of the carton blank 5 beneath the glue applying rollers 32 and 33. This is accomplished by cam means which includes a pair of elongated cam members 80. Each of the cam members 5t) is seated in an elongated track 81. The tracks 81 are disposed slightly outwardly of the frame rails 16, as is best shown in FIG- URE 2, and are supported by suitable support members of the frame structure 15, including the yoke 17.

Each cam member 3@ is provided with two spaced cam inserts S2 and 83. The configuration of these earn inserts is best shown in FIGURE l. A rod 84 is connected to the rear end of each of the cam members S0 and extends rearwardly therefrom. The individual rod 84 passes through an upper portion of a bracket 85 which is secured to an outer end of the transverse bar 13, there being two of the brackets 85. The rear end of each rod i541 includes an externally threaded portion 86 which passes through its respective bracket 85. A pair of nuts 37 are threadedly engaged on the threaded portion S6 and clamp against opposite sides of the respective bracket S5. In this manner, the cam members Sil are adjusted `and xed with respect to the piston rod 12.

A cam follower arm assembly, generally referred to by the numeral 38, is secured to each outer end of the shaft 2&1 outwardly of the associated upright 19. Each cam follower arm assembly 88 cooperates with its associated cam member Si) to pivot the shaft 24 and thereby raise and lower the glue applying rollers 32 and 33 and their associated glue pans 34 and 35.

Reference is now had to FIGURE 7, wherein the general details of one of the cam follower arm assemblies S3 are illustrated. Each cam follower arm assembly S8 includes a cam follower arm S9. The cam follower arm 3@ is provided adjacent the rear end thereof with a bore 93 which receives an end of the shaft 24 and rotatably journals the cam follower `arm 89 on the shaft 24. The forward end of the cam follower arm 89 is provided with an outwardly projecting boss 91 which has a bore 92 therethrough. As is best shown in FIGURE 2, a fastener 93 extends through the boss 91 and mounts a cam follower @d on the inner side of the cam follower arrn 39, the cam follower 94 overlying .and engaging the respective one of the cam members 8d.

riChe cam follower arm assembly 88 includes a second arm 95 which is provided at the rear end thereof with a boss 96 which extends away from the cam follower arm 89. The boss 96 has a lbore 97 therethrough through which the shaft 24 passes. The arm 95 is secured to the shaft 24- by means of a setscrew 98 carried by the boss 96.

rThe arm 95 is shorter than the cam follower arm 89 and has secured to a forward portion thereof an angle bracket generally referred to by the numeral 99. The angle bracket @9 includes a vertical leg 1110 which is secured to the inner face of the arm 95, and a horizontal leg 101 which overlies both the arm 95 and the cam follower arm 39. An inwardly projecting extension 102 is secured to the lower part of the vertical leg 109; The purpose of the extension 102 will be set forth in more detail hereinafter.

The cam follower arm S9 has an intermediate projecting part 103 which is aligned with the angle bracket 99 and which projects away from the arm 95. The projecting part 163 has a vertically elongated slot 164 which is aligned with an internally threaded bore 165 extending through the arm 95 and the vertical leg 10i). A fastener 1M extends through the slot 104 and is threadedly engaged in the bore so as to connect together the cam follower arm S9 and the arm 95 for limited movement relative to each other.

The cam follower arm 39 and the projecting part 103 thereof are provided with a vertically disposed internally threaded bore 1137. The bore 1117 is aligned with a bore 168 formed in the horizontal leg 101. A fastener 169 extends through the bore 108 and is threadedly engaged in the bore 107. The fastener 169 serves to limit upward movement of horizontal leg 101 with respect to the earn follower arm 89.

Generally aligned with the bore 108 is an internally threaded bore 110. A setscrew 111 is threadedly engaged in the bore 11d and extends through the horizontal leg 101 and abuts the cam follower arm S9 ,and the projection 103. lt will be readily apparent that the setscrew 111, in cooperation with the fastener 169, rotatably positions the arm 95 with respect to the cam follower arm 39.

The projecting part 103 is provided with a shallow internally threaded horizontal bore 112. An anchor screw 113 extends into the bore 112 with a portion of the anchor screw projecting outwardly of the projecting part 163. Reference is now had to FIGURE l wherein there is illustrated a spring 114. There is one spring 114 for each of the cam follower arm assemblies S3. The spring 114 has its lower end anchored to an associated one of the frame rails 16, and the upper end thereof is engaged over the projecting part of the setscrew 113. Thus, each spring 114 serves to urge its respective earn follower arm assembly 38 downwardly and to urge the cam followers 94 thereof towards the respective cam member 80.

It is to be understood that as a carton blank is fed beneath the glue applying rollers 32 and 33, the cam members are moved together with the carton blank 5. As the cam followers 94 engage the cam inserts 32, the cam follower arm assemblies move downwardly with the result that the glue applying rollers 32 and 33 are lowered into engagement with the carton blank 5 to apply the glue or adhesive '7, as is shown in FIGURE 6 at the left end of the carton blank 5. As the carton blank 5 continues to advance, the cam followers 94 will ride up olf of the cam inserts 82 and the carton blank S will continue to move beneath the glue applying rollers 32 and 33 out of contact with the glue applying rollers. This movement continues until such time as the cam followers 94 engage the cam inserts 33, at which time the cam follower arm assemblies 88 move downwardly with the resultant downward movement of the glue applying rollers 32 and 33 into engagement with the carton blank 5 to apply the remainder of the glue or adhesive 7 to the carton blank 5. The carton blank 5, with the adhesive applied thereto, is then received by a folding mechanism (not shown) which is not a part of this invention, and the pusher head 9 and the cam members 80 move rearwardly to the right in FIGURE l. During the rearward movement of the cam members S0, the cam followers 94 would normally engage the cam inserts 82 and 83 so as to lower the glue applying rollers 32 and 33. However, this is not desired on the return stroke of the cam members 80. For that reason, it is necessary to provide suitable means for supporting the cam follower arm assemblies during the rearward movement of the cam members 80.

The means for holding the cam follower arm assemblies 88 in inoperative positions during the Ibackstroke of the cam members 80 includes a mounting bracket 115 which is secured to the frame rails 16 appearing in FIGURE l. A bell crank, generally referred to by the numeral 116, is supported from the mounting bracket by means of a fastener 117. The fastener 117 functions as a pivot for the bell crank 116. The bell crank 116 includes an elongated arm 118, which is generally horizontally disposed, and a relatively short arm 119, which is generally vertically disposed. It is to be understood that the arm 119 is vertically aligned with the projecting part 102 of its associated one of the cam follower arm assemblies 8S.

An angle bracket 120 is secured to the yoke 17. A solenoid type actuator 121 is supported by the mounting bracket 120. The actuator 121 includes a plunger 122 which has pivotally connected thereto a link 123. The opposite end of the link 123 is adjustably pivotally connected to the arm 118. When the plunger 122 is withdrawn in the actuation of the actuator 121, the bell crank 116 is pivoted in a clockwise direction to move the arm 119 beneath the projecting part 103.

Reference is now had to FIGURE 9, where it is shown that the upper end of the arm 119 is provided with an axially extending bore 124 which is internally threaded. An adjustable stop member 125 is threaded in the bore '3 124- and is retained in an adjusted position by means of a lock nut 126.

Reference is now had to FIGURE 10, wherein there is shown the wiring diagram for the solenoid type actuator 121. The solenoid type actuator 121 includes a coil 127 which has a power line 128 connected to one end thereof. A wire 129 is connected to the opposite end of the coil 127. The wire 129 is connected to a normally open switch 130 which is provided with a holding coil 131. The switch 133 is also connected to a power line 132 so that when the switch 134i is closed, the coil 127 will be energized. One end of the holding coil 131 is connected to the wire 129. A wire 133 is connected at one end to the opposite end of the holding coil 131 and at the other end thereof to the power line 132. Incorporated in the wire 133 is a normally closed switch 134. Thus, once the switch 130 is closed, the holding coil 131 will hold it in its closed position until such time as the switch 134 is moved to an open position.

Referring once again to FIGURE l, it will be seen that the switches 13) and 134 are supported by the frame rails 16 in spaced relation. The switch 131) is provided with an actuator 135, and the switch 134 is provided with an actuator 136. The actuators 13S and 136 are positioned for engagement by one end of the transverse bar 13.

Operation In the operation of the carton forming machine, the fluid motor 113` is operated to reciprocate the piston rod 12. As the piston rod 12 moves on its in stroke, the pusher head 9 and the cam members 80 ar moved from right to left. The pusher head 9 engages a lowermost carton blank S from the blank stack S and moves it to the left. As the forward edge of the carton blank 5 approaches the glue applying rollers 32 and '33, the cam followers 94 engage the cam inserts 82 so as to lower the glue applying rollers 32 and 33 into engagement with the desired areas of the carton blank 5. The carton blank 5 is continued to be moved from right to left, with the result that as long as the glue applying rollers 32 and 33 are in their lowered positions, glue is applied to the carton blanks 5. Once the cam inserts 82 have passed from under the cam followers 94, the glue applying rollers 32 and 33 are elevated, and the glue applying operation is discontinued.

As the carton blank 5 continues in its movement to the left, no glue is applied thereto until such time as the cam followers 94 engage the cam inserts `83, at which time the glue applying rollers 32 and 133 are again lowered into engagement with the carton `blank 5. The carton blank 5 is continued to be moved to the left, with the result that glue is applied to the carton blank to the rear edge thereof. When the rear edge of the carton blank is aligned with the glue applying rollers 32 and 33, the glue applying rollers 32 and 33 are elevated by the riding of the cam followers 94 up out of the cam inserts 8f3 onto the main part of the cam members 80.

After the cam inserts 33 have passed the cam followers 94, the transverse bar 13 engages the actuator 135 for the switch 1311 and closes the switch 130. This results in the energization of the solenoid type actuator 121 and the resultant swinging of the arm 119 under the projecting part 1113 to hold the cam follower arm assemblies S8 in their elevated positions. The direction of movement of the piston rod 12 is now reversed, with the result that the pusher head 9 and the cam` members 80 move from left to right. Since the cam follower arm assemblies 88 are supported by the arm 119, when the cam followers 94 become aligned with the cam inserts 82 and 83, the cam follower arm assemblies 88 are not lowered. When the transverse bar 13 reaches the rear part of its stroke, it engages the actuator 136 to momentarily open the switch 134- which is normally closed, thus breaking the circuit to the holding coil 131 and opening the circuit to the solenoid coil 127. This results in the swinging of the arm 119 to its inoperative position. The machine is now ready to feed another carton blank through the glue applicator 18.

At this time, it is pointed out that the cam inserts 8-2 and `83 may be replaced to vary the length of the application of the glue. The Width of the area covered by the glue may be controlled by varying the Width of the glue pans.

While an example apparatus has been disclosed herein, it is to be understood that the specific form of apparatus may be varied without departing from the spirit and scope of the invention as dened in the appended claims.

I claim:

1. A glue applicator comprising a frame, a glue applying roller, reciprocating feed means connected to said frame for moving an article past said glue applying roller, means mounted adjacent said glue applying roller for supplying glue to said roller, roller mounting means connected to said frame and mounting said glue applying roller for movement towards and away from the path of movement of the article, and roller positioning means responsive to the movement of said feed means, said roller positioning means being connected to said roller mounting means for moving said glue applying roller into engagement with the article in timed relation to the movement of the article past said glue applying roller, said roller mounting means including a pivot shaft, said roller positioning means including a cam connected to said feed means reciprocatory for movement therewith, an arm connected to said pivot shaft, a follower carried by said arm and engaged with said cam for effecting the pivoting of said pivot shaft to position said lglue applying roller, and roller support means engageable with said arm for retaining said glue applying roller in an elevated position during a return stroke of said feed means, whereby glue is applied to a preselected portion of the article.

2. The glue applicator of claim 1 wherein said roller support means includes a pivotally mo-unted support member, and control means responsive to the movement of said feed means to the end of its feed stroke to pivot said support member into supporting. engagement with said arm to render said cam ineffective and to retain said glue applying roller in an elevated position during the return movement of said feed means.

3. The glue applicator of claim 2 wherein said control means includes a solenoid connected to said support member and a switch for said solenoid operated by said feed means at the end of its feed stroke.

4. 'I'he glue applicator of claim 2 wherein said control means includes a solenoid connected to said support member, a iirst switch for actuating said solenoid, and a second switch for de-energizing said solenoid, said switches being aligned with said feed means yfor engagement by said feed means with said rst switch being disposed at the end of the feed stroke and said second switch being disposed at the end of the return stroke of said 4feed means.

5. A glue applicator for applying glue to preselected areas of sheets and like articles comprising an elongated frame, means on said frame for guiding articles along a predetermined path, reciprocating feed means carried by said frame and including a pusher for moving an article along said path, a support iixedly carried by said frame above said path, a pivot shaft journalled for rotation relative to said support and carried by said support, said shaft extending transversely of said frame, support members secured to said shaft for limited rotation therewith, a glue applying roller carried by said support members forv rotary movement remote from said shaft, said glue applying roller overlying said path and being normally urged theretowards, a glue pan carried by said support members for supplying glue to said glue applying roller,

arm means rigidly secured to said shaft for rotationally positioning said shaft and vertically movingsaid glue applying roller, a cam follower carried by said arm means, an elongated cam, means yon said frame supporting said cam beneath said cam follower and connecting said cam to said feed means for longitudinal reciprocating movement therewith, said cam follower being normally retained in a glue applying roller supporting position by said cam and said cam having at least one recessed area to receive said cam follower in a lowered position wherein said glue applying roller may assume a lowered glue applying position, and means adjacent said arm means for engaging said arm means at the end of a feed stroke of said feed means and retaining said arm means elevated during a return stroke of said feed means to render said cam ineffective during the return stroke.

6. The glue applicator of claim 5 wherein said pan is removable from said roller mounting means and said glue applying roller, and said pan has a resiliently urged latch member releasably engaging said pivot shaft and resiliently urging said pan into engagement with said roller.

7. The glue applicator of claim 5 together with means for rendering said arm means engaging means inoperative at the end of the return stroke to again make said cam effective.

8. The glue applicator of claim 5 wherein said arm means includes a rst arm pivotally mounted on said pivot shaft, said cam follower being carried by said iirst arm, a second arm secured to said pivot shaft, and an angular adjustable connection between said iirst and second arm whereby said glue applying roller may be vertically adjusted.

9. The glue applicator of claim 5 wherein said glue pan has side walls and a bottom wall, one end of said glue pan being open and being closed by said glue applying roller when said glue pan is in position, said side walls projecting beyond said bottom wall and engaging said glue applying roller in sealed relation, and a glue control plate for controlling the thickness of a glue `lilm applied to said glue applying roller, means adjustable securing said glue control plate to said bottom wall for adjustment towards and away from said glue applying roller with said glue control plate forming an extension of said bottom wall.

`l0. The glue applicator of claim 5 wherein said glue pan is seated between a pair of said support members, said glue pan having an open end' opposing said glue applying roller with said open end being configurated to receive said glue applying roller and said glue applying roller closing said open end, said glue applying roller through its engagement with said glue pan aiding in the supporting thereof, and latch means carried by said glue pan and engaging said pivot shaft supporting said glue pan remote from said glue applying roller.

11. The glue applicator of claim 10 wherein said latch means includes a resiliently urged pivotally mounted lever having a releasable interlocked engagement with said pivot shaft, said lever reacting on said pivot shaft to urge said glue pan into engagement with said glue applying roller.

References Cited in the i'lle of this patent UNITED STATES PATENTS 2,095,258 Kimball et al Oct. 12, 1937 2,130,786 Bergstein Sept. 20, 1938 2,242,177 Ferguson May 13, 1941 2,553,592 Kucklinsky May 22, 1951 2,622,555 Rudolph Dec. 23, 1952 2,764,123 Derderian Sept. 25, 1956 

